Li-Ion Battery Electrolyte Composition for Low-Impedance High-Voltage Storage
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Solution Overview
Problem
Lithium-ion batteries face safety issues at higher voltages, which hinder their development towards higher energy density, and there is a need to improve storage impedance, swelling, and overcharge performance.
Innovation Solution
An electrolytic solution comprising specific compounds (Formula I, Formula II, and Formula III) and additives (lithium salts, copper ions, and other components) that form protective films on the cathode and anode, reducing oxidation and swelling, and enhancing safety and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods (ammonium fluorosulfonate mixed with lithium hydroxide aqueous solution) are used to prepare electrolyte, then lithium fluorosulfonate electrolyte can be obtained, but the process requires high skill level, has poor reproducibility, and involves complex purification steps
Solution Approach 1:
The patent changes the preparation method parameters by using direct dissolution of lithium fluorosulfonate in water instead of the conventional two-step process involving ammonium fluorosulfonate and lithium hydroxide. This parameter change simplifies the process from multiple steps requiring precise control to a single-step dissolution process, improving reproducibility while reducing complexity
Solution Approach 2:
The patent extracts and eliminates the intermediate steps involving ammonium fluorosulfonate and lithium hydroxide from the preparation process. By directly dissolving lithium fluorosulfonate in water, the method removes the need for purification steps and skill-intensive operations, achieving both simplified procedure and improved reliability
2Ease of manufacture
If conventional electrolyte preparation methods are used, then lithium fluorosulfonate can be obtained, but the process involves multiple steps including purification and requires high skill level
Solution Approach 1:
The patent uses pre-synthesized lithium fluorosulfonate salt and directly dissolves it in water, performing the essential action in advance. This eliminates the need for on-site synthesis and purification steps, making the manufacturing process easier and faster while maintaining product quality
Solution Approach 2:
The patent extracts and removes the time-consuming purification steps and skill-intensive operations from the preparation process. By using direct dissolution of lithium fluorosulfonate, the method eliminates intermediate processing steps, significantly reducing preparation time and improving ease of manufacture
3Reliability
If conventional methods are used to prepare lithium fluorosulfonate electrolyte, then the electrolyte can be obtained, but the process has poor reproducibility and requires high skill level
Solution Approach 1:
The patent changes the operational parameters from complex multi-step synthesis with precise control requirements to simple direct dissolution. This parameter change makes the operation easier to perform while ensuring consistent, reproducible results across different operators and conditions
Solution Approach 2:
The patent uses a self-dissolving process where lithium fluorosulfonate naturally dissolves in water without requiring skilled intervention. This self-service approach eliminates the need for high skill levels while ensuring reproducible results, making the process both easier to operate and more reliable
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The electrolytic solution reduces storage impedance, improves swelling resistance, and enhances overcharge performance, leading to safer and more efficient lithium-ion batteries.
Implementation Method 1
a positive electrode, a negative electrode, and an electrolyte solution containing lithium ions
Data Source
AI summary
The present application relates to an electrolytic solution, and an electrochemical device using the electrolytic solution. The electrolytic solution of the present application includes the compound of Formula I and a carboxylate compound: The electrochemical device prepared with the electrolytic solution of the present application has reduced storage impedance, and improved post-storage swelling, overcharge performance and hot box performance.